Improvement of engine performance with high compression ratio based on knock suppression using Miller cycle with boost pressure and split injection

doi:10.1007/s11708-019-0621-3

Front. Energy

2019, Vol. 13

Issue (4) : 691-706 https://doi.org/10.1007/s11708-019-0621-3

RESEARCH ARTICLE

Improvement of engine performance with high compression ratio based on knock suppression using Miller cycle with boost pressure and split injection

Haiqiao WEI, Jie YU, Lei ZHOU(

)

State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China

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Abstract

In theory, high compression ratio has the potential to improve the thermal efficiency and promote the power output of the SI engine. However, the application of high compression ratio is substantially limited by the knock in practical working process. The objective of this work is to comprehensively investigate the application of high compression ratio on a gasoline engine based on the Miller cycle with boost pressure and split injection. In this work, the specific optimum strategies for CR10 and CR12 were experimentally investigated respectively on a single cylinder DISI engine. It was found that a high level of Miller cycle with a higher boost pressure could be used in CR12 to achieve an effective compression ratio similar to CR10, which could eliminate the knock limits at a high compression ratio and high load. To verify the advantages of the high compression ratio, the fuel economy and power performance of CR10 and CR12 were compared at full and partial loads. The result revealed that, compared with CR10, a similar power performance and a reduced fuel consumption of CR12 at full load could be achieved by using the strong Miller cycle and split injection. At partial load, the conditions of CR12 had very superior fuel economy and power performance compared to those of CR10.

Keywords high compression ratio knock Miller cycle split injection engine performance

Corresponding Author(s): Lei ZHOU

Online First Date: 22 April 2019 Issue Date: 26 December 2019

Cite this article:

Haiqiao WEI,Jie YU,Lei ZHOU. Improvement of engine performance with high compression ratio based on knock suppression using Miller cycle with boost pressure and split injection[J]. Front. Energy, 2019, 13(4): 691-706.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-019-0621-3
https://academic.hep.com.cn/fie/EN/Y2019/V13/I4/691

Fig.1 Schematic of experimental setup

Tab.1 Specifications of single-cylinder engine

Tab.2 Resolution and accuracy of experimental apparatus

Tab.3 Operation conditions of baseline cases

Fig.2 Torque and BSFC of baseline cases at full load for CR10 and CR12

Fig.3 Knock tendency for different cases (percentage of knock cycles, CA50, and P_max at IT22)

Fig.4 Average temperature and P-V trace of Miller cycles with boost pressure at IT20

Fig.5 Pressure, pressure oscillation, heat release rate, and MFB for different strategies at IT22

Fig.6 Combustion performance of different cases for CR10 (BSFC, CA50, torque, and IMEP-COV)

Fig.7 Percentage of knock cycles and P_max of different injection strategies at IT10

Fig.8 Best BSFC, torque of different injection strategies, corresponding IMEP-COV, and ignition timings

Fig.9 BSFC and torque of different cases for CR12 and CR10-LIVC60+ 1.4 bar (BSFC and efficiency)

Fig.10 Torque and CA50 of different cases for CR12 and CR10-LIVC60+ 1.4 bar

Fig.11 Torque and BSFC of Miller cycle with boost pressure at different ignition timings and different compression ratios at full load

Fig.12 Combustion performance of different compression ratios at partial loads (BSFC, CA50, torque, and IMEP-COV)

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